Grinding and polishing machine



July 26, 1949. J, ADAMS 2,477,358

GRINDING AND POLISHING MACHINE Filed June 24, 1946 43 a4 Il 44 J n'hn. Mai DTL --A cfams Inventor Patented July 26, 1949 UNITEDSTATES PATENT OFFICE J ohnMason Adams, Farley, Mass. Application June 24, 1946, Serial No. 678,816

This invention relates to a novel construction of machine for use in grinding and polishing and has particular reference to a machine of the type in which a driven endless belt performs the grinding or polishing operation.

A primary object of the present invention is to provide a machine of the above described character having means to facilitate the adjustment of thevarious parts thereof for tensioning the grindingand polishing belt, for canting the belt with respect tothe work and for raising, lowerin and tilting awork supportto correctly position the work for engagement by the belt.

Other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawing, which illustrates a preferred embodiment thereof, and wherein. n l l Figure 1 is a side elevational yiewj of preferred embodiment of the machine, shown partly in sec tion; f t

Figure 2 is a top plan view thereof; t Figure ,3 is transverse vertical sectional view taken substantially along a plane as indicated by the line 3-3 of Figure 2;

Figured is an enlarged transverse vertical sectional view taken substantially along a plane as indicated by the line 4-4 of Figure 1, and

Figure 5 is an enlarged fragmentary vertical sectional view of a portion of one of the pulleys over which the grinding and polishing belt is trained. v l

Referring more specifically to the drawing, the machine in its entirety is designated generally 6 and includes a base i which is adapted to rest on 1 a suitable supporting surface and may, if desired, be suitably secured thereto. Thebase 'i is provided adjacent one end thereof with an upwardly and "outwardly inclined standard 8, which is sei a cured thereto as by means: of a fastening 9. The standard 8 is provided with a transverse sleeve portion In in which is received a bushing l i. The bushing l l is adjustably fixed in the sleeve Ii! by meahsof set screws l2; Ashaft i3 is journaled in the bushing I I and is provided with a protruding end on which is mounted a pulley M. A nut I5 engagesthe threaded terminal of the protruding end of the shaft l3 for detachably retaining the pulley I4 in applied position. The shaft It may be provided with anti-friction bearing means,

not shown, interposed between said shaft and the bushing ll.

A pair of guide rod l6 are supported in parallel relationship above the opposite end of theplatform 1 and lengthwisethereof by posts ll which 2 Claims. (Cl. 51-435) rise from the platform I and which engage the ends of the rods H5; The standard, designated generally [8 is provided with an enlarged base l9 having openings extending longitudinally therethrough and disposed insubstantially parallel relationship. Said openings 2b are adapted to slidably receive the rods It, as best seen in Figure 3, to mount the standard l8 for lengthwise sliding movement with respect to the base 1. The standard It! comprises a lower section 21 and an upper section 22 having opposed faces provided with opposed arcuate grooves 23 which extend in a direction lengthwise of the machine 6 and which are engaged by a pin 24. As best seen in Figure 3, the pin 24 supports the upper standard section 22 with its bottom surface in spaced apart relationship to the top surface of the lower standard section 2|.

As best seen in Figures 1 and 2 the adjacent portions of the standard sections 2| and 22 are provided with flanges 25 which project from opposite sides of the sections 2| and 22 and in directions lengthwise of the machine 6. The superimposed fianges 25 are provided with screw fastenings 26 which extend through opposite ends thereof and which engage threaded openings 21 in the lower flanges 25. It will thus be readily apparent that the screw fastenings 2B are located at diagonally opposed corners of the sections 2! and 22 and on opposite sides of the pivot pin 24, so that by loosening either of the fastenings 26 and tightening the other fastening 2'5, the upper standard section 22 can be tilted transversely with respect to the lower standard section 2i. i

A feed screw 28 is provided with a threaded portion adjacent one end thereof which extends through and threadedly engages a threaded opening 29 in the standard 8. Said threaded portion of the feed screw 28 terminates in a handle or knob 3|], ;which is located on the outer side of the standard 8. The opposite end of the screw 28, which is unthreaded, extends through and is journaled in an opening 3| of the standard section 2 I. Said last mentioned end of the screw 28 is provided with a pair of collars 32, as seen in Figure 1, which engage opposite sides of the standard section 2|. a l

The upper standard section 22 is provided with a transverse bore 33 which opens into enlarged recesses 34 formed in opposite sides of the section 22 and each of which contains an anti-friction bearing means 35 including a plurality of ball bearings and inner and outer bearing races. A shaft 36 extends loosely through the bore 33 and is provided with spaced portions which are Further, the

journaled in the anti-friction bearing means 35, The shaft 36 is provided with an enlargement or collar 3'. which bears against the outer side of one of the bearing means 35 and which is provided at its outer end with a restricted threaded shank 38 to receive a belt pulley 39 which is detachably clamped thereon by a nut 46 and which is disposed substantially in longitudinal alignment with the belt pulley I4. The opposite end of the shaft 36 protrudes from the opposite side of the standard section 22 and is splined or keyed to a belt pulley 4|. The shaft 36 is preferably provided with a washer or narrow collar 42 which is located between the pulley 4| and the adjacent bearing means 35. The belt pulley 4| is driven by an endless belt 43 WhiCh iS trained thereover and driven by suitable driving means,

A table or platform 60 is provided with depending bifurcated brackets 6| which are located adjacent one edge thereof and Which are connected tothe upper ends of the legs or rods 58 by pivot pins 62 which extend therethrough for pivotally mounting the table top 60 on the rods 58,

not shown, for revolving the shaft '36 and the V belt pulley 39.

An endless abrasive or polishing belt 44 is trained over the belt pulleys l4 and 39 and is driven by said pulley 39, with the pulley l4 acting as an idler pulley. As illustrated, the pulley 39 is substantially larger in diameter than the pulley l4, but it is to be understood that the relative diameter of the two pulleys may be varied. The belt pulleys i4 and 39 each includes an inner or hub portion 45 which may be formed of metal oi'any other suitable material and a rim portion 46 which is disposed around the periphery of the inner portion 45 and which is preferably formed of synthetic rubber, and'whi'ch is provided with a plurality of outwardly opening circumferential extending grooves 41. The synthetic rubber rims or tires 46 are employed on the belt pulleys I4 and 39 for engagement with the abrasive belt 44; it having been discovered that synthetic rubber may be more pulleys than natural rubber andis more practical for use inv connection with an abrasive belt. The grooves 41 are provided to afiordbetter traction for the belt 44 and the thickness of the tire or rim portion 46 may be varied depending upon the type of work for which the belt is being utilized. The belt 44 may be formed of any suitable abrasive material, the fineness of which may vary or may be impregnated, coated or have an abrasive material otherwise applied thereto. belt 44 may be dressed with tallow or paraflin wax to eliminate the collection of dirt and foreign matter behind the grain thereof.

The base I is also provided with two upstanding standards 48 and 39 which are disposed interthe ends thereof and in longitudinally spaced relationship to one another. The standard 48 is secured as by welding 50 at its lower portion to the upper side of the base 1. The standard 49 is provided with an elongated base 7 portion 5! having a downwardly opening longitudinally extending groove 52 received the upper end of a pin 53. The pin 53 is anchored in the base I, as seen in Figure I. The base portion 5i is also provided with an elongated slot 54 through which a threaded bolt 55 extends. The belt 55 engages athreaded opening or recess 56 in the base 1 and is adapted to be tightened to function in connection with the pin 53 to fixedly position the standard 49 relatively to the base 1. However,

inwhich is slidably Each of the standards 48 and 49' is provided with an upwardly opening bore 51' for detachablyreadily formed on the belt loosening the vspaced standards as best illustrated in Figure 4. The table top 66 includes top and bottom plies 63 and 64, respectively, which may be formed of any suitable material and an intermediate ply 65 which is preferably formed of synthetic rubber. As seen in Figure 2, the plies 63, 64 and 65 are connected adjaoent the corner of the table top 66 by fastenings 66. r

The rods or legs 58are located inwardly of the belt 44 and between the screw '28 and the lower flight of said belt and are pivotally connected to the table top 60 along its inner longitudinal edge to position said'table top betweenv the top and bottom flights of the grinding or polishingb'elt 44.

The work to be ground or polished is pIaced on the upper surface of the table or platform 66 and may be suitably held or clamped thereto to be engaged by the inner, abrasive side of the upper flight of'the driven abrasive or polishing belt 44( The'table top Bll'may be raised or lowered relatively to the upper flight of the belt '44 by set screws 59, adjusting the rods 58 in the bores 51' and thereafter tightening said set screws for correctly positioning the work not shown, supported on the table top 60 for engagement by the belt ,44. Further, the table top 60 may be tilted in a direction lengthwise of the machine 6 by vertically adjusting one of therods or legs 58 relatively to the other and as such adjustment will cause the rods 58 to be moved toward or away from one another, the screw fastening 55 may be loosened to permit adjustment of the standard 43 toward and away from the standard '48 to compensate for this movement of the rods 58. Likewise, andas previously described, the fastenings 26 can beadjusted for tilting the standard section 22 and the shaft ,36 laterally to cant the belt 44 sothat by thus adjusting the table top 60 and belt 44, a substantial universal adjustment of the work with the abrasive belt may be' obtained. It will be readily apparent that the screw 28 is adjusted for tensioning the belt 44 and may also function for varying the tension of the driving belt 43,

Various modifications and changes are contema plated and may obviously be resorted to without departing from the spirit and sco e of the inven,-

tion as hereinafter defined by the appended claims.

I claim: I 1. In a grinding andipolishing machine, a base, rising from the base, a shaft journaled in each sive belt, a work support attached to and rising from said base and including a platform or table located between the upper and lower flights of a piece of work to be engaged by the inner side of, the upper flight of the abrasive belt, said work support being adjustable for varying the elevation of said platform or table top to move it toward or away from the upper flight of the abrasive belt and for tilting said table top in a direction lengthwise of the belt, and adjustable means for tilting one of said belt pulleys for canting the belt flights relatively to the table top.

2. In a grinding and polishing machine, a base, spaced standards rising from the base, a shaft journaled in each of said standards, said shafts being disposed substantially parallel, a belt pulley keyed to each of said shafts, an endless abrasive belt trained over said belt pulleys, one of said shafts being adapted to be driven for driving the endless abrasive belt, a work support attached to and rising from said base and including a platform located between the upper and lower flights of said abrasive belt for supporting a piece of work to be engaged by the inner side of the upper flight of the abrasive belt, and one of said standards having an upper section in which one of the shafts is journaled and which section is mounted for rocking movement about an axis disposed parallel 6 to the longitudinal axis of the belt to rock the shaft carried thereby in a vertical plane for canting the belt relatively to the platform.

JOHN MASON ADAMS.

REFERENCES CITED The following referenlces are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 395,720 Starr Jan. 8, 1889 938,692 Olsson Nov. 2, 1909 1,042,354 Kroeze Oct. 22, 1912 1,853,516 Erickson et al Apr. 12, 1932 1,972,316 Randolph Sept. 4, 1934 2,064,483 McCaleb Dec. 15, 1936 2,152,279 Herchenrider June 13, 1939 2,416,493 Newton Feb. 25, 1947 FOREIGN PATENTS Number Country Date 43,987 Germany July 23, 1888 

